Early results showed a tight race in US battleground states Tuesday as Joe Biden hopes that a polarized electorate will defeat President Donald Trump in the face of a deadly pandemic.

Preliminary figures showed a deeply divided nation and mixed signs for each candidate, with Biden appearing to underperform in the crucial state of Florida as Trump made inroads in Cuban-American-dominated Miami.

But Biden was also outpacing Trump in suburban areas that have traditionally tilted to the president's Republican Party including around Atlanta in Georgia.

US networks projected winners in several expected states after polls closed, with Biden winning vote-rich Virginia as well as tiny Vermont and Trump triumphing in Indiana, Kentucky and West Virginia.

Historic bellwether Ohio -- where, like Georgia, Biden has seen hope after months of polls showing comfortable margins for Trump -- was yet to report most results as polling closed at 7:30 pm (2330 GMT).

But with more than 100 million Americans voting ahead of Election Day due to the Covid-19 pandemic, definitive results could take hours or even days in the most crucial states such as Pennsylvania.

US Opinion Polls
US opinion polls Photo: AFP / STAFF

Trump, 74, expressed confidence as the evening approached, tweeting in all his characteristic all-caps: "WE ARE LOOKING REALLY GOOD ALL OVER THE COUNTRY. THANK YOU!"

In a break with the traditional firewall between campaigns and government, the norm-shattering Trump scrapped an event at his hotel in Washington and was watching results at the White House.

It was not clear whether he would speak to the public at some point but he said earlier Tuesday that he wasn't yet "thinking about a concession speech or acceptance speech."

"Winning is easy," he said. "Losing is never easy -- not for me."

Biden, hunkered down with family at home in Delaware, likewise said that voter patterns during the day seemed to favor his side.

"What I'm hearing is that there's overwhelming turnout. And overwhelming turnout particularly of young people, of women, and an overwhelming turnout of African American voters, particularly in Georgia and Florida, over the age of 65," he told reporters.

"The things that are happening bode well for the base that has been supporting me."

Joe Biden and Donald Trump
Americans finally vote to choose between four more years of President Donald Trump or his challenger, Democrat Joe Biden Photo: AFP / JIM WATSON

Trump has repeatedly refused to confirm he will accept the results of the election -- a first for a US president. He argues, without offering proof, that the vast number of mail-in ballots could be used to rig the polls against him.

In the final run-up to Election Day, Trump focused especially on Pennsylvania, which allows ballots postmarked by Election Day to be counted, even if they arrive afterward.

"The whole world is waiting," Trump said early Tuesday.

"You can't have these things delayed for many days," he went on, adding ominously that "a lot of bad things" can happen.

"We should be entitled to know who won on November 3," he said.

However, he somewhat dampened fears that he will try to declare victory prematurely, telling Fox News that he will only declare "when there is victory."

"There is no reason to play games," he said.

Americans could not be more divided over Trump.

For some he represents a breath of fresh air who brought his business instincts to shake up the Washington establishment. For the other half of the country, he is a corrupt leader who wrecked the US reputation abroad and stoked dangerous racist and nationalist sentiments at home.

In Miami, Juan Carlos Bertran, a 60-year-old Cuban-American mechanic, said Trump "seems better to me for the country's economy."

"Now I have two jobs," he said. "Before I only had one."

But voting in New York, Megan Byrnes-Borderan, 35, said Trump's threats to challenge the election results in the courts were "scary."

"I believe that Trump will go through all odds to try to win the election," she said.

Another New York voter, Justin Rodriguez, 32, said he was voting for Biden. "I really don't like the tension," he said. "I think Trump has brought a lot more tension than we usually have."

Fearing unrest, store owners boarded up windows in Washington and other major cities.

Biden has targeted widespread public disapproval for Trump's handling of the Covid-19 pandemic, which has killed more than 230,000 Americans.

Trump -- who recovered quickly from his own bout with the virus in October -- is gambling that Americans want to put the crisis behind them and reopen the economy fully. Biden, in contrast, is preaching caution and accuses the president of having abandoned his basic responsibilities.

"We're done with the chaos! We're done with the tweets, the anger, the hate, the failure, the irresponsibility," Biden said at an election eve rally in Cleveland, Ohio.

Roughly one-third of the Senate is up for grabs and Republicans risk losing their 53-47 majority.

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